Z8F082ASH020SC datasheet(175/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

On-Chip Debugger

Z8 Encore! XP® F08xA Series

Product Specification

157

DBG

← 0DH

DBG

← Data Memory Address[15:8]

DBG

← Data Memory Address[7:0]

DBG

← Size[15:8]

DBG

← Size[7:0]

DBG

→ 1-65536 data bytes

• Read Program Memory CRC (0EH)—The Read Program Memory CRC command

computes and returns the Cyclic Redundancy Check (CRC) of Program Memory using the

16-bit CRC-CCITT polynomial. If the device is not in DEBUG mode, this command re-

turns FFFFH for the CRC value. Unlike most other OCD Read commands, there is a delay

from issuing of the command until the OCD returns the data. The OCD reads the Program

Memory, calculates the CRC value, and returns the result. The delay is a function of the

Program Memory size and is approximately equal to the system clock period multiplied

by the number of bytes in the Program Memory.

DBG

← 0EH

DBG

→ CRC[15:8]

DBG

→ CRC[7:0]

• Step Instruction (10H)—The Step Instruction command steps one assembly instruction

at the current Program Counter (PC) location. If the device is not in DEBUG mode or the

Flash Read Protect Option bit is enabled, the OCD ignores this command.

DBG

← 10H

• Stuff Instruction (11H)—The Stuff Instruction command steps one assembly instruction

and allows specification of the first byte of the instruction. The remaining 0-4 bytes of the

instruction are read from Program Memory. This command is useful for stepping over in-

structions where the first byte of the instruction has been overwritten by a Breakpoint. If

the device is not in DEBUG mode or the Flash Read Protect Option bit is enabled, the

OCD ignores this command.

DBG

← 11H

DBG

← opcode[7:0]

• Execute Instruction (12H)—The Execute Instruction command allows sending an en-

tire instruction to be executed to the eZ8 CPU. This command can also step over Break-

points. The number of bytes to send for the instruction depends on the opcode. If the device

is not in DEBUG mode or the Flash Read Protect Option bit is enabled, this command

reads and discards one byte.

DBG

← 12H

DBG

← 1-5 byte opcode

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